Viagra causes dilation of blood vessels and increased blood flow to the penis, facilitating erection. Viagra acts by inhibiting which of the following events?

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#Question id: 11919

#Unit 10. Ecological Principles

Frequent disturbances could lead to failure of a community to reach a climax community as one seral stage keeps replacing itself, a condition known as

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#Question id: 10367

#Unit 6. System Physiology – Plant

Cyanobcteria also fixes nitrogen under anaerobic conditions without  heterocyst where?

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#Question id: 4999

#Unit 11. Evolution and Behavior

In the 5—7 million years that the hominid lineage has been diverging from its common ancestor with the great apes, dozens of hominid species have arisen, often with several species coexisting in time and space. As recently as 30,000 years ago, Homo sapiens coexisted with Homo neanderthalensis. Both species had large brains and advanced intellects. The fact that these traits were common to both species is most easily explained by which of the following?

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#Question id: 19213

#Unit 12. Applied Biology

In Agrobacterium tumefaciens Crown gall formation is the consequence of

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#Question id: 16483

#Unit 12. Applied Biology

In plasma clot the explant is cultured on the surface of a clot help to to study the action of